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This work presents compensation algorithm schemes used in power quality conditioners applied to three-phase fourwire systems, allowing harmonic current suppression and reactive power compensation which results in an effective power factor correction. The strategies used to extract the three-phase compensation currents are based on the synchronous reference frame method. Although this method is itself based on balanced three-phase loads, it can also be used for single-phase loads, allowing independent control of all three phases. The compensation algorithms presented are implemented for two power conditioners, such as the Unified Power Quality Conditioner (UPQC) and the line-interactive Uninterruptible Power Supply (UPS) system, which allow the choice of a suitable compensation strategy resulting in either balanced or unbalanced sinusoidal source currents under balanced or unbalanced load …